Everything with mass has gravity. The force of gravity depends on how massive the objects are and how far apart they are. When an object is in free fall near the Earth's surface, it falls at a constant rate of 9.8 m/s2 due to gravity. While weight depends on gravity, mass stays the same regardless of location.

1. Universal GravitationUniversal Gravitation
 EverythingEverything
that hasthat has
mass, hasmass, has
gravitygravity

2. Universal GravitationUniversal Gravitation
 When something is very large,When something is very large,
like the Earthlike the Earth
 The gravity is easy to detectThe gravity is easy to detect
 Harder to detect the gravity ofHarder to detect the gravity of
really small objectsreally small objects

3. Universal GravitationUniversal Gravitation
 The force of gravityThe force of gravity
depends on:depends on:
 How massive the objectsHow massive the objects
areare
 How far apart the objectsHow far apart the objects
areare

4. Universal GravitationUniversal Gravitation

5. Universal GravitationUniversal Gravitation
When gravity is the onlyWhen gravity is the only
force acting on an object,force acting on an object,
Its in “free fall”Its in “free fall”

6. Universal GravitationUniversal Gravitation
Free fall near the Earth’sFree fall near the Earth’s
surface is constantsurface is constant
Fall at a rate of 9.8 m/sFall at a rate of 9.8 m/s22
(g)(g)

7. 0 m/s
9.8 m/s
19.6 m/s
29.4 m/s
39.2 m/s
49.0 m/s

8. Universal GravitationUniversal Gravitation
 GravityGravity
affects everyaffects every
object equallyobject equally
regardless ofregardless of
mass in amass in a
vacuumvacuum

9. Universal GravitationUniversal Gravitation
 Weight depends on gravityWeight depends on gravity
 Weight and mass areWeight and mass are
proportional to each other,proportional to each other,
 But theyBut they are notare not the samethe same
thingthing

10. Universal GravitationUniversal Gravitation
The moon’s gravity is 1/6The moon’s gravity is 1/6thth
thatthat
of the Earth’sof the Earth’s
8 lb bowling ball would weigh8 lb bowling ball would weigh
about 1.33 lbs on the moonabout 1.33 lbs on the moon
What about its mass?What about its mass?
Stays the sameStays the same

11. 485 lbs
240 lbs
129 lbs
150 lbs